You might want to wait and see if Aperture is actually broken. I've identified other issues on Tess' computer that may be responsible for her difficulties. She claims the problem was caused by the upgrade, and she's currently cleaning up her files for a back-up and reinstall of the older OS, but, I've had problems before when the drive is close to full and her Aperture Library is way over the 120 GB I recommend for an active library, so, hang in for a few days before you decide it won't work on your new computer.
When we shared a computer I used to secretly throw out stuff. Now she has her own, stuff is piling up.